Pump and pressure-regulating unit



Fell 14, 1950 A. VON WANGENHEIM 2,497,247

PUMP AND PRESSURE REGULATING UNIT Original Filed Nov. 19, 1942 INVENTOR.

@wmf K. M

//Q, ATTORNEY Patented Feb. 14, 1950 PUMP AND PRESSURE-REGULATING UNITAdolf von Wangenheim, Detroit, Mich., assigner to Detroit LubricatorCompany, Detroit, Mich., a corporation of Michigan Original applicationNovember 19, 1942, Serial Divided and this application March 16, 1944,Serial No. 526,751

4 Claims. (Cl. 10S-42) This invention relates to'new and usefulimprovements in units for supplying liquor under pressure and moreparticularly to a combined pump, pressure regulating means and strainer.

An object of the invention is to provide a unit in which the componentparts may be readily assembled with accuracy in commercial quantityproduction.

Another object is to provide a pump and pressure regulating valve whichwill be quiet in operation.

The invention consists in the improved construction of parts and theircooperative relation to be more fully described hereinafter and thenovelty of which will be particularly pointed out and distinctlyclaimed.

In the accompanying drawings to :be taken as a part of thisspecification, there is fully and clearly shown a preferred embodimentof the invention, in which drawings:

Figure 1 is a view in front elevation of a combined pump, strainer andpressure regulating valve embodying the invention, but with the pumphousing cover member in section and showing the regulating valve inlongitudinal central section;

Fig. 2 is a view in section on the line 2-2 of Fig. 1;

Fig. 3 is a detail view in section on line 3-3 of Fig. 1, and

Fig. 4 is a detail sectional View on the line 4-4 of Fig. 1.

Referring to the drawings by characters of reference, I designatesgenerally a body or housing member having a chamber 2 formed by acup-like cover member 3 having a surrounding flange 4 which seats in andagainst the base of an annular recess in a flat chamber wall 5.Extending from the wall 5 and away from the chamber 2, there is a hollowextension E having a bore 1 extending longitudinally therethrough. Thebore 1 has a cylindrical portion 1a opening into the chamber 2 throughsubstantially the middle point of the wall 5 and has, intermediate itsends, an enlarged diameter portion 8 and a bearing or guide portion 9 ofreduced diameter relative to the diameter of the bore portion 1a. Withinthe chamber 2 there is a pump casing II! having end closure platemembers I I, I2 between which there is clamped a hollow annular statormember I3. The end closure member I2 has an external fiat face I4 whichseats against the at wall 5. Projecting from the face I4 there is ahollow eX- tension I 5 which extends through the bore 1 and fits theguide portion 9, The extension I5, except for its t in the portion 9, isin circumferentially spaced relation to the Wall of the bore 1 so as toprovide for liquid flow in the bore 1 around the extension I5. Thepassageways I6 are provided in the wall of the hollow extension 6 topermit communication between opposite sides of the portion 9. Journaledin the pump casing extension I5 and projecting therefrom, there is apump drive shaft I1 which extends out of the housing extension 6.Surrounding the shaft I 1 and screwthreaded, as at I8, into the outerend of the bore 1, there is a closure member I9 which tightly clamps themarginal edge portion of a sealing member 2U against an outward facingshoulder 2| in the extension 6. The member 20 is preferably of flexiblyresilient sheet material, such, for example, as Ameripol having insertedfabric. On the shaft I1 there is a two-part thrust member 22 which has arotary t on the shaft I1 and between the parts of which there is tightlyclamped the inner peripheral portion of the annular sealing member 20.The thrust member 22 is urged toward the extension I5 by a coil spring23 which abuts against the closure member I9 and urges the thrust member22 into rotary sealing engagement with the face of an annular flange 24projecting concentrically with the shaft I 1 and from a collar 25,preferably press-fitted on the shaft I1. The collar 25 is limitedagainst endwise movement toward the thrust member 22 by a split'ring orwasher member 26 which seats in a circumferential groove 21 in the shaftI 1. A thrust washer or bearing pad 28 surrounds the shaft I1 and ispositioned between the collar 25 and the end face of extension I5 totake the thrust of spring 23.

The drive shaft I1 extends through the casing I0 in eccentric relationto the internally cylindrical surface of the stator member I3 and isjournaled in the end closure member II. Keyed on the shaft I1 andfitting between the closure members l I, I2,there is a rotor 29 ofannular form and concentric with shaft I1. The rotor 29 has tangentialengagement with the cylindrical surface of stator I3 as at 30, see Fig.2. Accurate tangential sliding fit is provided by means of the locatingpins 3 I, 32 which have their longitudinal center lines intersecting anextended line at right angles to and joining the shaft longitudinalcenter line and the line of tangential contact. The pin 3| fits in a onediameter hole through the closure members I I, I2 and stator I3 but hasits end portions, which are located within the closure members I I andI2, cut or formed to provide a diametrical flat portion which, beingtransverse to the above mentioned extended line, will permit slightradial movement of the stator toward and from the rotor. Any such radialmovement is, however, prevented after tight tangential contact isobtained and this is accomplished by means of the pin 32 which has atight t in alined apertures in the closure members II and I2 and alsohas a tight t in the bore of a bushing 33, whichv bore is alined withthe closure member apertures. The bushing bore is drilled or formedafter the rotor and stator are in tight tangential contact so that noradial play of the stator relative to the rotor is permitted when thepin 32 has been inserted in its locking position. In order to eliminateany possibility of a shifting of the parts I I, I2 and I3 relative toeach other, they are frictionally clamped tightly to each other by meansof screws 34.

The rotor 29 carries a plurality of radially reciprocal vanes 31positioned in guide slots which open into annular grooves 36 concentricwith shaft I1 and in the opposite faces of the rotor. In the grooves 36there are ring members 38 which support the inner ends of the vanemembers 31 and hold them in contact with the eccentric internallycylindrical face of the stator I3. Openingl from chamber 2 into the endclosure member II substantially parallel to the plane of the rotor 29,there is an inlet conduit 39 which terminates. adjacent the point oftangential contact 39 and in registry with a cross passage 4I)v in thestator I3 and the abutting portion of member I- I. This cross passage 40opens into the pump inlet port which is in the form of arcuate recesses4I in the inner faces of the end members II, I2 respectively, and whichare in registry w-ith the crescentshaped space between the rotor and thestator, On the opposite side of the point 38 from inlets 4I, there is anexhaust or outlet port which comprises arcuate recesses 45 in themembers II and I2. From the exhaust recessy 45 in plate member I2, seeFig. 3, there is an exhaust outlet port 52 which opens through theclosure member face I4 into registry with an outlet passageway 53opening through the flat chamber wall 5 of the housing member I. Theexhaust port or passage 52 is in communication through a conduit 54 withone of the annular grooves 36 so that the vane members 31 are urged bypump pressure against the stator wall.A

The pump casing I is secured rigidly in position and with the face I4 intight sealing en- .gagement with the flat chamber wall so that the umpcasing seals communication between th ore '1 and the chamber 2. Thisy isaccom- "-.Dl'ishel see Fig. 4, by frictionally clamping the I0 to thewall 5 by means of screws 56,

thefc'rews 56 being of smaller diameter than the 51 through the casingI9 through which screws 56 pass, so that the extension I5 canbgfaccurately v alined with the guide portion 9, thereby eliminating anyiiexing or setting up of twisting stresses in the casing I0.

Within the chamber 2, there is a strainer memvinner-58 of cylindricalform which ts over the being of an external diameter provide aiclearancespace around its external circumference-within the cover member 3. Thisstrainer member may be composed of an inner cylinder of ioraminousmaterial 59, such as wire screening, which serves as a base or supportfor a cylindrical pad of filter material 60. The cover member 3 istightly clamped and sealed in position against the wall 5 by means ofclamping screws 6I which engage the cover member iiange 4.

In the housing member I there is an inlet passageway 62 which opensthrough the wall 5, as at 63, externally of the strainer member 58 sothat fluid flowing through the conduit 62 must pass through the strainermember 58 in order to reach the pump inlet passageway 39. The inletconduit 62 may have a pipe or other conduit member 64 secured theretoand leading from a source of fluid supply. The outlet conduit 53 fromthe pump extends through the wall of the housing I and opens, as at 65,into a pressure regulating valve means 66 and particularly into thepressure chamber 6,1 thereof. The regulating means 66 also includes aby-pass chamber 68 and these chambers 61 and 68 are separated by apressure responsive member 69, preferably a sheet of ilexible,stretchable, resilient material, such, for example, as Ameripol. Betweenthe chambers 61, 68, the housing member has an internal annular shoulder10, on which the marginal portion of the member 69 seats. A clampingring and guide member 1I overlies the shoulder 19 and clamps themarginal edge of the member 69 in tight sealing relation thereto. Thering member 1I is held in position by a hollow clamping nut 12screw-threaded within the chamber 68. Slidably guided Within the ringmember 1 I, there is a cup-shaped backing member 13 having its baseportion seating on the pressure responsive diaphragm member 69. Throughthe diaphragm member 69 and the cup member base portion, there is acentral alined opening through which there extends a tubular valve seatand guide member 14 having an annular clamping iiange which seatsagainst and tightly clamps the diaphragm member 69 to the cup memberbase portion. The seat member 14 extends through the cup member baseportion and is rigidly secured thereto and has a projecting end portionwithin the chamber 68. Within the cup member 13 and seating on its base,there is a silencer disc member 15 of exible, stretchable, resilientmaterial, such, for example, as Ameripol and having a small opening 15atherethrough registering with the bore of the seat member 14. Thissilencer member 15 is held at its marginal edge portion tightly againstthe bottom of the cup member 13 by a flanged washer 16 having a tightfit in the cup member 13 and by a helical coil spring 11 which seats atone end on the washer 16. The spring 11, at its other end, abuts anadjustment abutment means 18 by which the force of the spring 11 can beadjusted to determine the force acting on diaphragm member 69 in chamber11, which will move the diaphragm member 69 toward the by-pass chamber68. Leading from the by-pass chamber 68 through the wall of housingmember I, there is a by-pass conduit 18%, which opens at its outlet end,as at 19, into the bore portion 1EL around the extension I5 and betweenchamber 8 and the valve casing closure of bore 1. The fluid whichempties into chamber 8 through conduit outlet 19 is free to pass througha port 80, see Fig. 4, into a passageway 8| which opens atits lower end,as at 82, externally of the housing I for connection of a pipe orconduit leading back,

for example, to the source of fluid supply. The other or upper end ofthis passageway 8| may be closed by a screw plug 83, thereby closing offcommunication between the passageway 8| and a passageway 84 which opensinto the chamber 2, as at 85, see Fig. 4. If desired, the passage outlet82 may be closed by a plug and the plug 83 removed, so that flow frompassageway 8| will pass through passageway 84 into the chamber 2 andreturn to the pump inlet passageway 39. The pressure chamber 61 has anoutlet port or passageway 86 controlled by valve means 81, which ispreferably in the form of a double ended valve member also controllingthe owY through the seat member 14 into the by-pass chamber 68. The boreof the seat member 14 provided a bypass outlet from the pressure chamber61. The valve member end portion cooperable with the seat memberpreferably has a bleed slot 88, so that any entrapped air or gas will bedischarged and not cause the pump to lose its prime or be air bound. Thespring 11 urges the seat member 14 into closing relation against thedouble ended valve member 81 and urges this member 81 into closingrelation with the outlet 86. A spring 89 tends to move the valve means81 into open relation with respect to the outlet 86 and does so move thevalve member 81 when pressure in the chamber 61 moves the diaphragmmember 69 upward or toward the by-pass chamber 68. A stop member 90 isprovided to limit the movement of valve means 81 by the spring 89, sothat when the valve means has been opened a predetermined distance, theseat member 14 can thereupon move away from the valve means 81 to openthe by-pass port into the by-pass chamber 68. This action of the valvemeans 81 is well understood in the art and no further explanation istherefore necessary.

The operation of this combined pump, regulating means and strainer unitand of the parts of the same is as follows. It is, of course, assumedthat the unit is utilized for supplying oil to an oil burner, forexample, so that the outlet 86 is connected to the burner and the inletconduit 64 is connected to a source of liquid fuel, and the outlet 82 isconnected back to the fuel source. When the pump is started oil will bedrawn into the chamber 2 through the inlet conduit 62 and through thestrainer member 58 and the inlet passageway I39 to the pump inlet ports4I. The rotating vanes 31 will discharge the oil under pressure into theoutlet recesses 45 and the outlet 52 and through the restricted port 55into the outlet passageway 53. Due to the conduit 54, oil will, ofcourse, be held under compression in the annular grooves 36, therebymaintaining the vane members in contact with the cylindrical statorsurface.

The oil which is discharged through the passageway 53 will be fed intothe pressure chamber 61, see Fig. 1, and when the pressure has built upso that the force exerted against the diaphragm 69 is sufficient toovercome the force of the compression regulating spring 11, then thediaphragm member 69 will be moved toward the by-pass chamber 68, thuspermitting the valve means 81 to move toward open position or upward,thereby permitting the discharge of oil through the outlet passage 86 tothe burner. When the pump gets up to speed and is discharging out at arate to create the maximum desired pressure in chamber 61 and at theburner, then, upon any pressure increase, the diaphragm member 69 willmove away from the valve means Cil 81, thereby opening the by-pass portthrough seat member 14. The extent of opening at the valve seat member14 will, of course, vary with the pressure in chamber 61. The oildischarging into chamber 68 will be fed therefrom through the passageway18 into the chamber 8 and thence through port 88 to the outlet ofpassage 8| which leads back to the supply tank. If, as above noted, theoutlet/82 is closed by a plug and the screw plug 83 is removed, thenthis bypass oil will be discharged through the by-pass 84 back into thechamber 2 for return to the pump.

The silencing feature of the pressure regulating means functions byautomatically controlling the flow area of the small opening 15a. Thepressure in chamber 61, which is suicient to lift the diaphragm member69, will, if its flow is at a greater rate than can be handled by thesmall opening 15a, cause the disc member 15 to stretch upward, therebyincreasing the size of the small opening 15'. Therefore, instead of theoil which discharges through the seat member 15 being sprayed into thechamber 68 with a hissing noise, the oil will be confined by the port orsmall opening 15a and be discharged into chamber 68 as a solid stream.It will, of course, be apparent that the size of the opening 15 willvary automatically, in accordance with the pressure of the liquidagainst the inlet side of the disc member 15.

This application is a division of my copendlng application Serial No.466,116, filed November 19, 1942, for Pump and pressure control means(Patent No. 2,460,047).

What is claimed. and is desired to be secured by Letters Patent of theUnited States is:

l. An apparatus of the character described, comprising a housing memberhaving an end wall and a side wall enclosing a fluid inlet chamber, afluid inlet to said chamber and a fluid outlet through said end wall,said housing member having a hollow extension from said end wall and abore through said end wall intercommunicating said extension and saidchamber, a closed pump casing unit in said chamber spaced laterally fromsaid side wall and seating on said end wall, said casing unit having atubular shaft supporting extension projecting through said bore andspaced for at least a portion of its length from the wall of said hollowextension, a drive shaft extending from and through said tubularextension, means sealing said shaft to said hollow extension, an endwall of said pump casing unit closing off communication between saidchamber and said hollow extension, said pump casing unit having an inletopening into said chamber, said pump casing unit end wall having anoutlet registering with and sealed to said chamber end wall outlet,pressure regulating means having a pressure chamber with a valvecontrolled outlet and a valve controlled by-pass, said pressure chambercommunicating with said housing member chamber outlet, a conduit leadingfrom said valve controlled Iley-pass and opening into the space aroundsaid shaft supporting extension, and a by-pass conduit communicatingwith said space and communicable with said fluid inlet chamber and witha point exterior of said housing member.

2. An apparatus of the character described, comprising a housing memberhaving an end wall and a side wall enclosing a fluid inlet chamber, afluid inlet to said chamber and a uid outlet through said end wall, saidhousing member having a hollow extension from said end wall and a borethrough said end wall intercommunieating said extension and saidchamber, a closed pump casing unit in said chamber spaced laterally fromsaid side wall and seating on said end wall, said casing unit having atubular shaft supporting extension projecting through said bore .andspaced for at least a portion of its length from the Wall of said hollowextension, a drive shaft extending from and through said tubularextension, means sealing said shaft to said hollow extension, an endwall of said pump casing unit closing off communication between saidchamber and said hollow extension, said pump casing unit having an inletopening into said chamber, said pump casing unit end wall having anoutlet registering with and sealed to said chamber end wall outlet, saidhousing member having a pressure chamber in communication with saidchamber end wall outlet and having a by-pass chamber in communicationwith the .space around said shaft supporting extension, a pressureresponsive member separating said pressure chamber and said 'oy-passchamber and having an opening therethrough, said housin' member havingan outlet from said pressure chamber, valve means controlled by saidresponsive member and controlling outilow from said pressure chamberthrough said pressure chamber outlet and through said opening, and meansto silence the noise of ilow through said opening into said by-passchamber.

3. An apparatus of the character described, comprising a housing memberhaving an end wall and a side wall enclosing a duid inlet chamber, afluid inlet to said chamber and a duid outlet through said end wall,said housing meniber having a hollow extension from said end wall and abore through said end wall intercommunicating said extension and saidchamber, a closed pump casing unit in said chamber spaced laterally fromsaid side wall and seating on said end wall, said casing unit having atubular shaft supporting extension projecting through said bore andspaced for at least a portion of its length from the wall of said hollowextension to provide a by-pass chamber, a drive shaft extending from andthrough said tubular extension, means sealing said shaft to said hollowextension, an end wall of said pump casing unit closing oiicommunication between said chamber and said hollow extension, said pumpcasing unit having an inlet opening into said chamber, said pump casingunit end wall having an outlet registering with and sealed to saidchamber end wall outlet, pressure regulating means having a pressurechamber with a valve controlled outlet and a valve controlled 'oy-pass,said pressure chamber communicating with said housing member chamberoutlet, a conduit leading from said valve controlled by-pass and openinginto said by-pass chamber around said shaft supporting extension, and aby-pass conduit opening from the exterior of said housing member andhaving its inner end communicating with said pump casing unit inlet, apassageway leading from said by-pass chamber and opening into saidby-pass conduit, anu a plug insertable through said by-pass conduit forclosing communication between said last-named passageway and said pumpcasing unit inlet.

An apparatus of the character described, comprising a housing memberhaving a at wall portion, a cup-like cover member having its rim securedand sealed to said wall portion to provide a fluid inlet chamber, saidwall portion having a hollow extension thereon and having a bore openingtherefrom into said chamber and having an inlet and an outlet alsoopening into said chamber, a pump casing unit in said chamber and havinga tubular extension projecting into and spaced for at least a portion ofits length from the wall of said hollow extension bore to provide aby-pass chamber, a drive shaft extending from and through said tubularextension, means sealing said shaft to said hollow extension, said pumpcasing unit having an end wall seating on said dat wall portion to closeoff communication between said by-pass chamber and said duid inletchamber, said casing unit having an inlet opening into said uid inletchamber, said casing unit end wall having an outlet registering with andsealed to said chamber wall outlet, a cylindrical strainer surroundingsaid pump casing unit and separating said chamber inlet said pump casingunit inlet, said cover member sealing and holding said strainer inposition, pressure regulating means having a pressure charnber with avalve 4controlled outlet and a valve controlled. lay-pass, said pressurechamber con municating with said housing member chamber wall outlet, aconduit leading from valve controlled by-pass and opening into saidoy-pass chamber around said extension, and a by-pass conduitcommunicating with said by--pass chamber and communicable with saidfluid inlet chamber and with a point exterior of said housing member.

ADOLF VON W'AITGENHEM.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,110,567 McAulay Sept. 15, 19141,655,173 Webber Jan. 3, 1928 1,675,079 Zisch June 25, 1928 1,871,043Chalmers Aug. 9, 1932 1,883,832 Smedstrand Oct. 18, 1932 1,897,432Klotzman Feb. 14, 1933 1,899,396 vRay Feb. 28, 1933 1,980,478 FretzelNov. l1934 2,032,284 Johnston Feb. 25, 1936 2,032,885 Murphy Mar. 3,1935 2,070,411 Powers Feb. 9, 1937 2,100,997 Russel Nov. 30, 19372,109,970 Grisell Mar. 1, 1938 2,123,950 Lattner July 19, 1938 2,149,969Lattner Mar. 7, 1939 2,159,720 Wahlmark May 23, 1939

